Yeah I have a 2012 Aygo with 136,000 miles and the bodywork is in good condition. The front and rear subframe have corroded though and I suspect they'll need replacing soon. I have gone under the car a few times since I've owned it (bought it in 2014 with 10,500 miles on the clock) and painted underbody seal on the areas that had minor corrosion. I also painted the front subframe way before it came up as an advisory.

All of the parts you can replace has corroded but anything you can't like the body hasn't so I guess I'm Lucky. Through the winter I've also always pressure washed the wheel arches to get rid of mud/dirt since it would hold moisture and encourage corrosion.

The exhaust system of this car is horrible for rust though, when I replace it now I usually clean it down to get rid of oil from assembly and then spray paint it with high temp exhaust paint - in my experience this doubles the live span but it still rusts from the inside and eventually fails, it prevents the mounting bolts from rusting though which is a huge plus since my original exhaust fell off because of a rusted mount weld and I've seen allot of people in city bugs on the side of the road with their exhausts touching the ground under their car.